Paper receptacle.



Patented Apr. 5,1910

C. F. JENKINS.

PAPER BEGEPTAGLE.

APPLICATION FILED IAB. 22, 1909.

- mission of heatto or from the contents of thefreceptacle.

UNITED STATES PATENT OFFICE.

CHARLES FRANCIS JENKINS, OF WASHINGTON, DISTRICT OF COLUMBIA". ASSIGNOR T0 SINGLE SERVICE PACKAGE CORPORATION OF AMERICA OF NEW YORK, N. Y.,

A CORPORATION OF NEW JERSEY.

PAPER RECEPTACLE.

Specification of Letters Patent.

Application filed March 22, 1909. Serial No. 484,873.

To all whom it may concern:

ful Improvements in PaperRece-ptacles, of

which the following is a specification, reference being had therein to the accompanying drawing. y

The object of this invention is to produce at a very low cost a receptacle having walls which :to an unusual degree prevent trans- To this end the receptacle walls have air confined between outer and inner layers or .between more than two successive'layers, air being, as is well known, a poor conductor of heat.

In the accompanying drawings, Figure 1 is an axial section of a cylindrical receptacle embodying one form of my invention. Fig. 2 is a cross section of the same receptacle. Fig. 3 is'a partialsection analogous to Fig. 1 lilllt showing two air, spaces In the body wa In these figures, A represents an inner cylindrical tube, about which is wound spirally a thick strip B making as many turns as may be desired in passing from the bottom to the top of the tube A, to which it issecured. Over this spiral strip is fitted and secured an outer tube C. For a short d15- tance from the ends of the tubes, the space between them, not occupied by the strip, is filled with any suitable material I) to bar the passage of air. The body s closed at each end by a cup-like body E having within its annular outwardly turned flange a closely fitting disk F preferably flush with the margin of the flange. This disk is preferably upwardly convex, primarily, as indicated'ln dotted lines, and is pressed to slightly concave form so that it is automatically held in place. The closure is thereby made toconfine within it a body of air, and

if it be inserted to the proper point in the tube, the latter when closed has a flush top, which for certain uses is highly desirable. D may be primarily plastic, self-hardening material, for example, paper pulp. It is evident that such a receptacle when made of suitable stock, paper, for example. is well calculated for heat-insulation, and is at the same time very stifl and well adapted for rou h handling, although it does not necessari y contain more than a small amount of stock, nor require'expensive stock. It may be noted that the tubular body may be formed. as are three-ply spirally wound tubes the intermediate strip being merely unusually thick and narrow, and hence that thecost of tube is no greater than that of such ordinary tube.

When desired, the receptacle may have more than one air space, and Fig. 3 illustrates one havingtwo such spaces, A, A G representing three concentric tubes spaced apart by strips B, B the closure cup E in this case being shown as provided with two spaced'dis'ks-F, F When necessary, and in fact usually, the receptacle is at least internally treated with waterproofing material. i

What I claim is:

The combination with an inner spirally wound paper tube, of a thick relatively very narrow flat paper strip spirally wound upon and closely fitting over the spiral joint in said tube; and a second paper tube closely fitting the outer surface of the spirally wound strip, the end portions of the open space between the tubes being filled with air-excluding materiah'substantially as set forth.

' In testimon whereof I atlix my signature in presence 0 two witnesses.

I CHARLES'FRANCIS JENKINS. Witnesses: f.

B. RDAMY, ARTHUR L. BRYaN Patented Apr. 5, 1910. 

